How to research your Irish genealogy using the Library of Congress

Starting your research into Irish genealogy can be daunting. Where do I start? Where are the best places to look? What kind of information can lead me to my ancestors?

The list of possible places where you could find information on your family is long, but luckily, the Library of Congress (the research library that officially serves the United States Congress) has put together this small but useful referencing guide to help you get out of the blocks and begin researching Irish genealogy and local Irish history.

Although the library admits that it is far from a comprehensive list and that, as you get further into your research, you may need to look to more specific resources, the guide serves as a great starter aid to get you over that intimidating first hurdle: working up the courage to begin.

Not only can the aid be used within the Library of Congress, but any other large library is likely to hold the same content as listed below.

Here are some of the Library’s suggestions:

Handbooks

Although some of them are now quite dated, there have been a number of handbooks published that aim to guide you through the genealogy research process. The LOC recommends “Pocket Guide to Irish Genealogy” (1991) by Brian Mitchell or “Irish Family History” (1990) by Marilyn Yurdan, among others.

Pedigrees and family histories

These resources focus on specific Irish lines and families, so unless your family was extremely well-off or part of the gentry, you are unlikely to find information on your particular family here.

Some recommendations:

“The Irish and Anglo-Irish landed gentry when Cromwell came to Ireland” (1884) by John O’Hare. “The Palatine Families of Ireland” by Henry Z. Jones. Bibliographies

If you’re looking to cast out your net very far at the start, these resources will be useful. Many of them list additional resources for research.

Some recommendations:

“Bibliography of Irish family history” (1982) by Edward MacLysaght “A guide to Irish bibliographical material: a bibliography of Irish bibliographies and sources of information” (1980) by Alan R. Eager. Local history

The Library of Congress contains many histories of Irish localities that may contain names and family information. One given example is the collection of letters written by John O’Donovan as he completed the first Ordnance Survey of Ireland between 1834 and 1841. The letters contain information about the people O’Donovan met with as he mapped the country, as well as the names he came across during this research.

Biographical information

Here you'll find not only published works on the more famous and influential Irish families but also collections of the names of judges, architects, and those who moved to different countries during certain periods.

Some recommendations:

“Irish families in Australia and New Zealand, 1788-1978” by Hubert William Coffey and Marjorie Jean Morgan “A biographical dictionary of architects in Ireland, 1600-1720” by Rolf Loeber Land, Property, and other records

Looking through land records is a great way to find out more about where your family lived and when. Listed in many of these records are the amount of land the family owned and the specific area. It may also use alternate spellings of both place and family names, so they can be difficult resources to work your way through accurately, but worth the time and effort.

Some recommendations:

“A census of Ireland, circa 1659; with supplementary material from the poll money ordinances (1660-1661). Irish Manuscripts Commission. “The Tithe allotment books”. IrishCentral History

Love Irish history? Share your favorite stories with other history buffs in the IrishCentral History Facebook group.

Maps, atlases, and gazetteers

Looking through older maps may be useful if you are having difficulty identifying your family's home place. Place names have changed over time, have changed spelling, or may have been anglicized, but if you can trace the place name through time, it will tell you the correct spelling to look for when you are looking for your family in certain older documents.

Some recommendations:

“A new genealogical atlas of Ireland” by Brian Mitchell “Philip's 19th-century county atlas of Ireland” with original consulting index and edited with a new introduction by John D. Blackwell & Laurie C.C. Stanley Blackwell. Names: Geographical

As with maps, these resources will help you weave through the maze of Irish topography.

Some recommendations:

“Ainm: bulletin of the Ulster Place-Name Society. -- Vol. 1” (1986). “A dictionary of Irish place-names” (1986) by Adrian Room. Names: Personal

By finding out more about your own family name and its origins and various spellings, you can hope to open up new doors in your research and other routes for you to take until you find the right path.

Some recommendations:

“Irish surnames and their possible locations for family history research” (1984) by James McClelland “Special report on surnames in Ireland. Together with Varieties and synonyms of surnames and Christian names in Ireland” by Robert E. Matheson. Periodicals

There have been many journals dedicated to investigating links to Ireland and tracing Irish heritage, some of which are still being published.

Some recommendations:

“Journal of the Irish Family History Society.” “Irish Family Links” from the Irish Genealogical Association. Religions

Parish registers are a goldmine for the genealogical researcher. You can look through records of different religions and churches, as well as graveyard registers.

Some recommendations:

“Guide to Irish Quaker records, 1654-1860” (1967) by Olive C. Goodbody “A guide to Irish parish registers” (1988) by Brian Mitchell. Wills

If one member of your family left a will in the past, it may list other family members and their relationship to them.

Some recommendations:

“Registry of Deeds (Ireland). Abstracts of wills,” edited by P. Beryl Eustace “Irish genealogical guides: a guide to copies & abstracts of Irish wills” by Wallace Clare. Emigration

Pinpoint the exact time your family left Ireland with these useful resources on Irish emigration.

Some recommendations:

“Irish passenger lists, 1847-1871: lists of passengers sailing from Londonderry to America on ships of the J. & J. Cooke Line and the McCorkell Line,” compiled under the direction of Brian Mitchell. “The Famine Immigrants: lists of Irish immigrants arriving at the port of New York, 1846-1851.” Ira A. Glazier, editor; Michael Tepper, associate editor. Irish in America

So you know the date your family left Ireland and where in the US they are all currently living, but what happened in the interim? Trace your Irish family's journey in America to the present day with this list of resources on Irish Americans.

Some recommendations:

“The Irish in America: immigration, land, probate, administration, birth, marriage, and burial records of the Irish in America in and about the eighteenth century,” edited by Michael J. O'Brien “Irish Settlers on the American Frontier” by Michael C. O’Laughlin.

If you wish to delve further into the Library of Congress’ resources, you can view the full list here.

* Originally published in 2016, updated in July 2026. 

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